Last updated: March 2, 2024
The weather in Black River Falls, United States, during September is characterized by an average temperature of 18°C (64°F). Highs can soar to 30°C (87°F), while lows may dip to 5°C (42°F). Typically, the humidity level in Black River Falls throughout September hovers around 80%.
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Average temperature
Maximum temperature
Humidity
In September, Black River Falls averages 104 mm (4.1 inches) of rainfall, typically over the course of 10 rainy days. The month enjoys an average of 12 hours 27 minutes of daylight, with the sun shining for approximately 8 hours 29 minutes each day. Additionally, there is a 59% probability of sunny days during this period.
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Chance of sun
In September, the UV Index in Black River Falls reaches a maximum of 7, indicating a level of High exposure. The most intense UV radiation typically occurs between 12:00 and 14:00, during which unprotected skin may burn in as little as 25 minutes.
| 07:00 | 08:00 | 09:00 | 10:00 | 11:00 | 12:00 | 13:00 | 14:00 | 15:00 | 16:00 | 17:00 | 18:00 | 19:00 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UVI | 1 | 1 | 2 | 4 | 6 | 7 | 7 | 7 | 5 | 4 | 2 | 1 | 1 |
| Exposure | Low | Moderate | High | Moderate | Low | ||||||||
| Time to burn | 45 min | 30 min | 25 min | 30 min | 45 min | ||||||||